Dry-kiln for lumber, &amp;c.



.. M. LEAVER.

DRY MLN PoR LUMBER, (sw.

u .n I M APPLICATION FILED MAY 24, 1012y l 1 ELSMRMW Patented A151225, will.

5 SHEETS-"SHURE l,

J. M. LEAVER. DRY KILN Foa LUMBBR, 50.

APPLIOATION FILED MAY 24, 191% "l, 1 08,37% Patented Aug. 25, 1914.

ATTORNEY J. M. LEAVER.

DRY KILN FOR LUMBEE., nim.

m APPLICATION IILBD MAY 24, 1912 4 u@ Ww Patented Aug. 25, 1914i SHEETS-SHEET 3.

ATTO R N EY J. M. LBAVEB..

DRY KILN POR LUMBER, (fw.

APPLICATION FILED MAY 24. 1912,

Patented Aug'. 25, 191.4.

5 SHEETS-SHEET INVENTC'R.v

J. M. LBAVER.

DRY KILN FOR LUMBBR, das. APPLIUATION FILED MAY Z4, 1912 1,108,377. .Patented Aug; 25, 1914.

v MENTS-SHEET 5.

ATTORN EY PUlSllTlll) STATES Prtf'llliildii tlFfliiiQlfilflii.

JAMES M. LEAVER, UF 'LONG BEACH. CALIFORNIA DRY-KILIM FOR LUMBER, 65o.

lr it known that l. .ludus M. lacfivnn, a ritizcu ol' tln Uniti-d Status. rrsiiling at Long' `lcavli. in tlucounty oi: lLos .tngclrs aud Stato ol' California. liarc invcntod a. new and usol'ul Dry-Kiln vfor Lun'ilicr. itc.. oll which tllo following' is a spcciiration.

'llic invention rolatob` to improrcinonts in liilns l'or drying' luxnlwr and otlicr inatorial.

'lllc object o'l' tlm pl'osont inrcution is to iluprovr tho construrtioa o'l' dr kilns. niortl cspvciall),Y that shown and doorrilicd in Patent No. 1,039.301, o'rautcd to nu Supt. 2l. 15H2. in which a portion o'l' lxot moist air lroni tho drviug rlmlulmr is inixcd within tor il'itroduccd into th(` drying chamber, and heated air and inoisturc is convovod from thc lattcr to tlm chimneys' or stacks through thc incdiuxn oi' suction ducts; and suction chalnllcrs.` and to loss-rn tho cost oi construction liy tllc elimination of piers or supports fo'rfthc railS and the roduccd doptli o tlibuilding.

A Al'urtlior object ol the inrcntion is to cnablc tl'ic tcniperiitnro, moisture. and circulationin thc' kiln to bo under more pori'rct oontrol than llorotoloro and to` pre'- vont absolutely any possibility of ucar contact of the 'heating moans with the stool( to lio dried and in conjunction witlrthc i1nprove'd mc'ans of circulation and oipializw' tion oftcniporatnre toavoidtho browning or'lni1"n'inr of thc stock and the checking and warping und other detects, whichfrev quo'ltly result 1n" lthe lower coriscs of thc The invention also haerV for its object to d raft: 'from th oviarhe-dj mixing' chamber' Specification of Letters Patent.

Application filed May 24,1912.

"operato with this arrange-- 'lHiiriiird lling. 295i, llllilet.. Serial No. 699.5%.

prcsion plan oi"l drying osrd in nrany kilns, and also to obtain lr3t\\'ccn Such oxtrrlnoa au \y drfil'cd mixture ot outsidc air and Ilot lnoisi' air roquirod liv tllc stock and an`\l rolulnc ol circulation oi' tlic saine.

itli tlirsc and otlxor objects; in rico". tlio inrcntioo ronoists in thc construction and uovcl combination ol' parto .licroinal'tcrfully described, illuntratcd in thc accmnpanying drawings. and pointrd ont in thc cloinlS liorrto appondcd; 'it boing understood that various rliano'rs in the fornn proportion. sim` and minor details of ianistrnction, within tllc scopo o l tl'wI claims, may lic resorted to without dcparting 'from tlic spirit or sacriicing any of tlio advantages oilz thc invcntion. l

in thc drawings: Figure i ia a. longitudinal arctional ricw ot' a portion oi" a dr)y kiln, constructed in accordance with this invention. Fig. 2 is a. transvcrsc sectional ricw oi tho same on tlm lino Z--Q of Figi'. l. Fig'. I3 is a Similar virw on the line 3---3 o Fig. l. Fi il is '.i horizontal acctional viow on the lino 4&4 ot Fig. E2. Fig; 5 is a longitudinal Sectional View on the lino :V1-5 ot'Fig.

Lilic numerals oi rct'oroncc designato `Corresponding parts inail thc tiguroo of the' drawings.

In tho accompanying drawings in which is illustrated the proiiorrcd embodiment" of thc invention, the kiln comprics in it@ con struction side walls; l and t?. dcsigncd to' loe constructed ot any onitaliic material.

The dry,r kiln, which may loc conotruotod' in'` a series, as indicated in Figs. i? ond 3 of thc drmvlngs, may, oi course, contnot oi'- afi-i111 *lc drying' chamber 4, and it is prm'idcd nt't o' top ot the same with' o hol'itontai ceiling .or top wall 5, spaced from ti'icroot" Bond'` 'supportedby studding 6 to thc undersid of which th'e'top wall or ceiling' Sis seourodf f'Ifhe intcrvoning Spncebotwecn tim #roof 3 and the' top wall or collingf is divided by:

oppositely inclined longitudinally dispoacd" partitions 7 and u'ccn'tral. 'vertical iongitw.

dinollyA disposed pzirtition 8 4.into olitr ion"- gitudinaluction clminloors El aiidinner ion-` gitudi'rinlly dislposed milling," oliinlilars 10. lgic partitions which nlayf iaoo @my prefrredfcoiotruotionq oxtilaid 'fronti thc opjp'oh site oido' Willis of thc lr'iln to tiro undorodo of thc rooiftand their lower oidc lore lociitod' slightly More tile;planoof`-tiiog..tpp wall or ceiling 5 of tlm dryiog-nhambda lili! 35 or passages 12.

The upper edges of the inclined partitions 7 are preferably spaced from the central vertical longitudinal partition, which extends lfrom the top wall or ceiling to the underside of the roof 3. The side walls 1 and 2,'tvl1ieh Aare hollow, are composed of inner and outer shells, and the interior space between the shells of each of the walls is divided by vertical partitions 1l -into alternately arranged heatiiig'and suction ducts or passages 12 and l3,`extending 'from the top to the bottom of the drying chamber and communicating, respectively, with' the mixing chambers 1() and the suction chain- 15 bers 9.

The kiln is provided with a bottoni 14, preferablyv supported above the surface of the ground by concrete blocks 15 to forni an air space 16 belowlthe bottom of the kiln.

2@ The bottom of the kiln,which is also hollow, may be constructed of any suitable material, and its interior space is -divided into transversely disposed ducts or passages 17 and 18, which extend across therkiln. The

lower transverse ducts or passages 17, which communicate at their ends with and conneet the lower terminals of the vertical heating ducts or passages, are provided in their lower walls with centrally arranged cold air 3g intake openings 19, communicating with the lower air space 16 for permitting the cold air from the outside atmosphere to enter the kiln and pass through the lower ducts or passages 17 to the vertical heating ducts The upper walls of' the lower cold air ducts or passages 1T are provided with centrally arranged openings E20, located at the bottom of the drying chamber` and adapted to permit portions ot' hot moist 40 air from the same to enter the cold air ducts and miX with the air from the outside atmosphere, a preliminary mixing taking place in the lower transverse cold air ducts or passages and in the vertical heating ducts or passages and a final and thorough mixing Aand commingling occurring in the upper or overhead mixing chambers where the mixture is' caused to travel in an approximately circular path and is given amore or lessl 0 whirling motion before entering the drying4 chamber, as hereinafter tlilly explained.

The kiln is equipped at the openings 1S) and i2() with dampers or vali/eli 2l, arranged in pairs and located at opposite sides ot' the 55 center of the suction ducts and connected by laingcs 2Q to oppositely inclined partitions or pieces 2B forming appioximately invert\ ed if-shaped deliectora, ane. adapted to separate or divide the moist alii' trom the lower 39 cold air duets or passages.- The dempers or valves and the partitions? or dkeflectors exlead entirely across the bottom ducts or passages il?, and dempers oil valves are adapted to be s y'ung upward/ly or dow '35 wardly-froiu the top to the bo/ttom walls of the ducts 17 to enable either the hot moist air or the cold outside air to be entirely excluded from the ducts or passages 17 and the dampers or valves are also adapted to be arranged at any intermediate point to obtain the desired proportion ot hot moist airand cold outside air to suit the character of, the lumber, or other material to be dried. The dampers or valves'are connected by links ,524 with arms 25 of rock shafts 26, journaled m suitable bearings Q7 and extendlng longitudinally of the kiln and arranged in the air space 1G at opposite sides otl the central air intake openings '12). The arms 44 extend inwardly toward the central openings and the links, which are located at opposite sides of the opening, are pivotally connected to the arms QG and to the valves or dampers 2l and extend through slots 2S in the lower wall of the bottom ducts or passages. "lf he l'rce edge 2l) of the valves or dempers are beveled to lit flat against the upper l'ace of the bottom walls of the ducts or passages 1T when the said valves or danipers are at the limit of their downward movenient, and they abut against the said bottom walls beyond the slots sons to completely exclude the cold outside air when closed. The longitudinal Arock shafts are equipped at one end of the .lt-iin with operating arms 30, and any Silitable means may be employed for securing the lower dampers or valves in their adjustment.

The vertical heating and suction ducts or passages of the adjacent members of a kiln consisting of a series of units are preferably staggered, as clearly illustrated in Fig. 4 ot' the drawings, and. when all of these ducts are of uniform area, the heating duct of one unit will be located directly opposite the heating duct of the adjacent unit, but `theyy `stringers 34 and the side wa ls, the spaces being covered by horizontal walls 35 and divided by transverse partitions /'3(5, which separate the transverse ducts or passages 17 and 18. The longitudinal feed and return pipes 252 and 33 are connected with the vertical heating pipes by branch pipes 37 and 38, equipped with suitable valves 5l) and 4t), adapted to enable steam or any other heating means to be shut. otl from any of the vertical heating pipes and this with the main valves will i" l li lili-,iwi

(mi shown) if the fami und i'iui'n pipas Plame-G; lili@ iemperiiiiu'e 0l fmnpleti Qontrol.

"lille i'm'tiuzil limiting ducts m' ipidsiilfgs the liiln. minimi.

i cinrumunimt@ :it their upper @mls willi lili@ iixiiiing chambers l() :it the 011ml- @lilies iliei'cf (nl, mul arranged. wlihm the mmm@ cliiimliei' mi ill-:z mimi side portion@ iliei'en'l? mi@ iin- "amil lilac iiwliimil imigii'ucliiiail inmiiiiuns i lfomniiig iii-,per piiiismiges -l-Q iiiiteiifliiigg lipi'wtll'y iiiifl ii'ivmi'illy f1-mii 'Julia upper maids nl lili@ (lucia oi' passages. lllm iiicliiiiiil fl@- lliwlmf's m' prii'tilimzls 1li, which ierimlfl lli@ @litirelcngili if th@ drying" chambers, mi, @imported Mr mpmd 0i" @Mmmm-slumped pierri @3, imi they; constitute fll @allora iiml forni lower flaring outlets or (lucia lo Verlaifciil iiifiiz' pmsmuges 44.-., lmitcl ai ille mi@ nl' lm (laying f :lmml'iczi' mill imma-uri. ivy limi-ii Lli. Th@ iiiclimfl illliwzoii; mi* mii lliliiiiisei l1 @www lli@ hmmm nii" 'Jill/mimi; illu iimfiiiip; clmirilieisi mi; apposita aldus limi-cwi" lin ihm-'0, upwardly muil mwm'dly imil im i'i-awww; mul pas@ downwardly mid iiiaimiiii'lly :iii im'lii'ilml lijf ill@ iiiimws iii ln 21 :mil il mi: faim drawings, itlwrany producing; :i partial.

mld ffoiiimii'iglestlm hut mist all" 21ml lili@ Mailed. mikfrum the outside ritmogpiwm lie- :lwe lh@ lutter enters the (l1-ying (rl-minlnv;

iii

iiilily imm-mieli iipmn the studffliiig G :mil ci:-

i'iiiisversely oli the mitm.' poi-moin si." tlm iiiipiiiiita mixing; chambers.

lllli@ toi) Wall 0i' sailing 5 lneimimitms @limi `ii im Sul@ Walls of ill@ lulu to llmiviflv Siri@ mpi/mugs 46, mill lille said dalles-ifi' 4&3 iliaiiil from ille tup will 0i' mailings; fi nl; tlm :iii'ifi mailings 4&6. 'lllw dafleulmis l5, willi-li @Mend longitudinally of ill@ fli'yiiiig" ulizunf Mei.' lii'nm am@ unil to the other of lli@ mmc-i.

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lm piled in any other desired mziniwl' :1mi

Siiiml of providing longitudinal sirio om ini; 14S, which are specially adapted lor tlm wil l..

illu iliyiiiig izliiiu'ilici' muy lie iii'xfzuigcil in any millet' ilesiieii imii'u'iei. 'llflie dawn imlt zilz iriipmiiie ssidw 0l! alim liiln is.; incriaised nml The @miams we miiisd lo prisas :Hung: thv saillie Wallis iii lylieilii'iiiriii mf lli@ llouim liutliiiii wl? time ili'yiiigi; iliiiiriliii, Us' (liif'm'lml through lili@ liimlii coms-sien; luy lili@ drawing Milon nl tlm immuni .Giliuiiuii Klimt@ mui. ille lint moisi. fili' liniaal@ iipciiiiig-1 ii'lii klu.l lzillxeif are iii um, iblrii, ilmfli (li'iiils lieiiig (mitalizd lo pi'mliic@ ii cm'i'iiiii, lelziwun twu lf'mils nl launiii@ l '.llliie ilziiiijii-.iss m" iiili'iis, which are pivotii f iiiiiiiiiiffil, nizw luf: operated by muy :mib :ililu "f1 im mill liiiiitliwisii piling', ilu-.i iipniiigs all; iii@ lmp mi. im.

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and a auction duct connected with the ehiinl ney or stack and communicating with the drying chamher at the lower portion thereoil to produce a down dirait through the @aid chamber and th permit heated air and moisture to pass therefrom to the stark.

ti. A dry kiln including a rlrying chamber, a auction chamber extending along the top of the kiln, retti l,al heating ductsl extending trom the bottom oi the kiln to the top oi the drying chamber and eoinlniuiicating therewith at the upper portion thereof, heatingr means located within the heating duets for causing a positive upward drait through the saine, said heating ducts eonnnunicatin with the outside atmosphere at the bottom ot the kiln, a iuraiity ot vertical suction ducts conneeterij with the suction chamber and communicating with the drying chamiier atthe hottorn thereojt to produce a 'posiitive down drat't intcriorly oi the drying rhnmlygr and ronreyingvaway heated air and moisture from the same, and a chimney or atar/l; connected with the suction chamber.

i. ii dryatiin including a drying chamher, vertical heating and suction duets located at the-sides oi' the drying chamber, the heating? duets beingr connected at their upper ends with the upper portion oi the drying ehaniher, hottom mining ducto located heneath the drying chamber and communicatingI with :the name and with theoutside atmosphere, bottoni suction ducts connected with the vertical auction duets and eommunicating with the lower portion of the drying rhamher to produire a down draft therein, a chimney or stach connected with the auction ducts, and heaping means; arranged in the heating ducto and producing an upward droit through the Same.

il. i dry hiln including a drying rhaiinher, vcrticai heating and :auction ducts located at the slides nii the drying ehaniher, the heating ducto connnunirating with the said chaniher at the top thereof, hottoni transverse mixing ducts; Aioeaiied heneaih the dryingl chamher and communicating with the Aaune und with theoutside atnioesphere, ineana tor contro-lling the admicsion ot eoid air Ai'rom the ouiaide atmoaphere and hot moist air lroln the drying chamher to the hottoan mixing ducts.y

and transverse hottom .duction ducts aiso iocated heneath the drying chamhers and eo1nniunicating with the name and connected with the suction ducts.

il. ri; dry kiln includin a drying chamber, reriiral heating ducts iocated at oppcuite aides oi the drying oi'ianihei and communicating' at #their upper ends; with the upper portion oi" the said chandail, iranuverfso inining ducta lecatwi heneath thedryingrhainher and connecting the oppoaite Vertical heat ing dottar and provided with openinga'con'imimicating `Vith the drying' chamber and with the outside atmosphere, fiainlueraY or valves operating at the said openings for controlling the admission of cold air and hot moist air to the bottom mixing ducts, and vertical suction dui-tn` located at the aides of the drying chamber and communicating with the lower portion thereof to produce ay down draii' within the name.

IO .i dry kiln including a drying ohamherfvertical heating ducts located at opposite aides of the drying chamber and commu nicating at their upper ends with the upper portion of the said chamber, tranaverae mixing duetaY located beneath the drying ehamher and connecting the opposite vertical heating ducts and irovided with o enings communicating with the drying oiamher and with the outside atmosphere, dampers or valves operatno at the said openings for controlling the admission of cold air and hot moist air to the bottom mixing duets, vertical suction ducts located at o )petite :sides oi the drying chamber, and ioottom transverse auction ducts also located `beneath the drying ehainher and extending aereas the ltiln and connectingr the vertical auction ducts; and provided with openings commuinenting with Vthe said drying chamber to prhduee a down draft through the name.

li. A dry kiln including a drying chainher, vertical heating ducta located at opprosite sides ot' the drying chamber and communicating ai the upper euro with the upper portion ot' the said chamber, transverse hottoni duets connecting the lower ende of the vertical heating ducts and provided with upper and lower openings communicating, respectively. with the said chamher and the outside atmosphere, approximately V- shaped defieriors arranged at the upper openings for dividing the moist air entering the transverse ducts, dampers or` valv'es hinged to the lideal ot' the V-.diaped defiec tornI and movable upwardly and downwardly ton/ard and tromthe Said openihgs, heating means lof-ated within the ducts and creating' pn upward 'draft therein, and suetion duras communicating Vwith the lower portion ifi the drying chamber for producu ing a down dra ft through the saine.

lf2. di'y kiln including a drying chauxn her, veriral heating ductuI located at `opposite aides ol' the drying chamber and commu nicating at the upper ends 'with the upper portion oi' the Said rhaulher, ti'anaverse hottorn ducts connecting the lower ends of the vertical heating ductsand provided Wit-h upper and lower openinga i,'onununicating,n reapectively, with the said chamber and the outuide atmosphere, approximately V- shaped dciieetora arranged at the upper openings; for dividing the inoiw't air entern'zg the transverse ducts. dempers or valves `hinged to the sides: ot the V-shaped delinctors and movable upwardly and downwardly toward and trom the and openmga,

spaced longitudinal rock shafts provided with arms. links connecting the arms with the danipe'rs?"or` valves, heating means located within the heating ducts *ari producing an upward dratt through the saine, and

suction ducts connected with the drying chamber for causing a down draft therein.

y13. A dry kiln including a drying chamber, vertical heating ducts located at opposite sides of the drying chamber and communicating at their upper ends with the upper poytionot the same, vertical heating pipes 4'located :within the heating ducts and pro- 1 ,means for creating a suction in the said suclvided with tion ducts.

14:. A dry kiln including a drying chamber, vertical heating ducts located at the sides of drying chamber and communicating at their lower portions with the outside atmosphere and connected at their upper portions with the drying chamber at the top thereofA` vertical suction ducts located at opposite sides of the drying chamber, and transverse suction ducts extending beneath the drying chamber and connecting the lower ends of the vertical suction ducts and provided with openings communicating with the drying chamber to produce a down draft therein.

' .15. A dry kiln including a drying chamber. vertical l'ieating ducts located at opposite sides ot' the drying chamber and commu:

nicating at'their lower portions with the outside atmosphere and connected at their upper portions with the drying chamber at the top thereof, vertical suction ducts located at opposite sidesI of the drying chamber and communicating with the outside. atmosphere, transverse suction ducts extending beneath 'the dryin chamber and connecting the lower ends of tie vertical suction ducts and proopenings communicating with the drying chamber through the bottom thereof to produce a positive down draft through the same and convey away heated air and moisture from the drying; chamber through the bottom openings, longitudinal suction ducts connected with the vertical suction ducts, and chimneys or stacks communicating with the suction ducts.

16. Aldry kiln including a drying cham-' ber, vertical heating ducts located at opposite `sides of the drying chamber, vertical suction ducts also located at opposite'sides of the drying chamber, bottom transverse Aupper ends ot the heating ducts, and longitudinal suction chambers located above the drying chamber and connected with the upper ends ot' the suction ducts.

17. A dry kiln including a drying chamber provided at the top with an opening, a mixing chamber located above the drying chamber and communicating with the same through the said opening, a vertical heating duct connected at its upper end with the' mixing chamber and at its lower end with the outside atmosphere, heating means arranged Within the heating duct to produce an upward draft through the same, and a suction duct communicating with the lower portion of the drying chamber to produce a down draft therein.

18. A dry kiln including a drying chainber provided at the top with a side opening, a vertical heating duct communicating at. its lower portion with the outside atmosphere, heating means located within the heating duct for producing an upward draft through the same, anupper mixing chamber connected with the upper end or the heating duct and communicating with the drying'chamber. an inclined defiector eX- tcnding from the upper end of the heating duct inwardly over the sfuleopeiiing, and a suction duct communicating with the lower portion of the dryingchamber to provide a down drafttherein.

19. A dry kiln including a chimney or stack, a drying chamber provided at the top with side openings, vertical heating ducts communicating at their lower portions with the outside atmosphere., means for connecting the upper ends of the heating ducts with the side openings of the drying chamber, heating niearisari'anged within the heating ducts and producing an upward draft through the same, and suction ducts connected with the drying chamber at the central portion of the bottom thereof and extending to the side walls and upwardly thereat to the chimney or stggkand adapted to vproduce a positive dowit through Lthe dryin .chamber and cqivy away heated air an moisture through this said bottom ofthe drying chamber. v

20. A dry kiln comprising a drying chainber providedat its top with side openings f5 ill iiml imm?.

mi@ op@ im@ cliarvnbiers und extending; ovm' tho .finiti o pienimjgs from this upper Midis of the imam in@v dimm mm1 forming lim-ing; ducts oi* pim boating; nii-iin ion-:Limi within i511@ hinting' dui-ts and producing im iipwiiifi inzit ihrougi'h illu www. :mii falicuon doom i-oiimut-ed wiiii tho :suction ('hniiximi :mii vonmmnirufiing with tim iowel yoi'iioiii o'ii Lim drying' i-ilamiber to produce zi down ciifiiii'i; thm-nin -l. A i1 ry liiiix ini-hiding sido Walla-i. ii roofi :i iop wiiii on ceiling' spzucd from the mini :1111i :Forming i drying uhzmiiim' und pi'oviil-:ii mi opposait@ sides with openings, pzwttioiisis dividing; the spuma btwoun the roof und Um iop willi mi' calling; into mixing; ami suction i'iiziinlm'", tim mixing; chambers comiimiii :Ming-ij with thi drying' uiumiiim' ighloumigfh'iiiii misi' opimiugfa. wewtiviii hunting dimilis im unimi mi: Hm sirioq oi Uw, drying; 'ciiiiml'ii-w ,mili commuvomiting? :zi Lhui' iower Midi; viii-ii impor omis. iwpoi'iively. wiil the mixing' i-lmnilnm'k; :md thv siwtion uhnmbcv's. heating im: with tho oppor poiigoii. if

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'izirnberJ-'ii' lower mixing duct located oo-l iiri-a'ili *bhe drying rhanilier and roiiiiniiiiiciiting iiiththe saine and with lie outside ai inospliere and coiiimtrd with 'the upper inizi-v iiig ohainlior. und :i Chimney or Strick oommiinirat-iiigg' n'ili Llio inving cliaii'iloer for proifliifing a circulation in the kiln.

12T. dry kiln inoliiding drying cliainhei', an opper mixing chamber ooniiniiiiicating with the upper portion oif the drying ('liaiiilier. a loworniixing dimi located be nrath the drying chainlirr and coinniiinieaiwith the saine and with rho outside al;- inospheref a heating duct haring heating means and connected with the loii'er vmining diict and the upper heating chamber, and a ohiinne)vv or mach communicating with the drying chamber.

9S. 'A dri' kiln including a drying chainlioi. iiioans for oondiicing nir from the ont aide atmosphere to the drying chamber and for introducing such air into the drying r'iaiinbor at the upper portion thereof, means for inviting said air to canse a positive up i "ward dratwoxteriorly of the drying Chani- `hoi', iiehininey or Stack, an outlet or suction rliivt extending downwardly :lroin the top of the kiln vto. iihe bottoni ortho drying Chain bei and"communicating at ythe npr-:ir end with ihr/'1 chimney or stack and at the lower i4-aofiii'fith'the interior of the drying; chamber .i l "iii, tiljieliwei' 4portion thereoi to prodnoo a, oonfviniioiis positive down draft through the y ig ohamlaer and positively. convey away ated air sind moisture ytlieref'roni to the "nthereoii-,and a damper for control.- ioe @scope ofsi'ioh heated air and, moisiiiire; i

"'Q, dry hihi including a dryingohain "hwg piieito nidos or' the drying' 'chamber and QX- "tlending lfroni Iihe bottoni to the top oi' the kiln arid Coii'iiiiiiiiiratiiig at their lower ends voiical diois or passages located at opii'ili the interior of rho drying chanihor at he bottoni thereof, a ohininey or stack oon iiered -nithsoine of the ducts or passages adapted to reato a'positivo and contin- 'ii'oiis' down draft through the drying Chaim boing also provided with air inleil4 openings r located. at the liottoni of the kiln and coniniunirating with Sonie of the said ducts or passages.

Ill). Ri dry kiln including a` lrying chainlier. :i ijorgiciil diiot or passage extending ironi the bottoni lo tho iop of the drying rhaaiher and coinn'iiinicaing at its ends `with ir iiierior or' rhe Sonie, vertical heating` pipes arranged in the said duct or passage ior cre 'ng an, np draft through the saine, :i vrrLioal outlet dar or passage also extending from the "rop to the bottoni of tho drying chandler and Communicating at its lower end with ihe interior thereof at the loii'e'r portion of the drying chamber to produce a positivo donn 'dr-alt. means for creating;v a suction in the oiitle' duct or passage, and si damper for controlling the escape of the heated air and moisture from the drying Chamber.

3l. A. dry ifi-ln ino-hiding" a drying ohanr ber, a vertical duct or passage extending: from the bottoni to the iop of `the interior of the saine, vertical healing pipes arrangrd iii lie said dimi or pas ige for creating an np cli-afi; through ine saine. a vertiral oiitlrt dart or passage also extending from the top eo the bottoni of the drying chainlier and coinniiiiioaing at ils lower ond with the infoior tl'iereof at the lower portion of tho drying cliaiiioer to produce :i posit-ive down draft. means for Creating a suction in tho oiitlol dirci or passage. a daiiipoi for oontrolliiig the es'apo or the heated air and inoibiiire. from bho drying; chamber, and an siii" inlet arranged ai die boroni of the kiln and ooiiiiiiiinicaiing 'with tho drying ohanihor at the Alop thereof.

lniosrinioiiy. Clint l rhiiin the foregoing: asini own, ll hare hereto allixed in v signa- .liire in. 'he presence of two wiliiesscs.

llitnob'ses r T. (hi ioiins'i',

1W. L. Ninn. 

